Drive force transmission device
a transmission device and drive force technology, applied in mechanical actuated clutches, friction linings, couplings, etc., can solve the problems of increasing surface pressure and significant decrease of the width of each fine groov
Active Publication Date: 2010-03-16
JTEKT CORP
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Benefits of technology
The present invention provides a drive force transmission device that can maintain desired characteristics for a long time. The device uses a lubricant oil between two rotating parts, each with a sliding surface facing each other. The first part has a diamond-like carbon film on its sliding surface, while the second part has a fine groove in its sliding surface. The ratio of the sliding area to the sliding surface of the second part is 55 to 90% at the initial stage of use. This design ensures a long-lasting, reliable drive force transmission.
Problems solved by technology
However, since the fine grooves of such shapes are difficult to form, typical fine grooves have substantially triangular cross-sectional shapes.
Thus, as the sliding surfaces become worn due to the long-term use, the width of each groove becomes gradually smaller, changing the drive force transmission characteristics.
However, if each fine groove has an increased width at the opening end, the sliding area of the sliding surface becomes excessively small particularly at the initial stage of use, thus increasing surface pressure.
This causes a significant decrease of the width of each fine groove when the sliding surface becomes worn.
Method used
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[0021]An embodiment of the present invention, or a drive force transmission device of a four-wheel-drive vehicle, will now be described with the attached drawings.
[0022]FIG. 1 is a view schematically showing the drive force transmission device. FIG. 2 is a diagram schematically showing the vehicle (the four-wheel-drive vehicle) including the drive force transmission device.
[0023]As illustrated in FIG. 2, a vehicle 1 is a front-wheel-drive-based four-wheel-drive vehicle. A transaxle 3 is secured to a side of an engine 2. A pair of front axles 4 are connected to the transaxle 3. A propeller shaft 5 is also connected to the transaxle 3. The propeller shaft 5 is connected also to a pinion shaft (a drive pinion shaft) 7 through a drive force transmission device 6. The pinion shaft 7 is connected to a pair of rear axles 9 through a rear differential 8, or a differential device. In the illustrated embodiment, the drive force transmission device 6, the pinion shaft 7, and the rear different...
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A drive force transmission device has an outer clutch plate and an inner clutch plate, which are rotatable relative to each other about a common rotational axis. The inner and outer clutch plates become frictionally engaged with each other with lubricant oil provided in between. The outer and inner clutch plates each have a sliding surface. The sliding surfaces face each other. A diamond-like carbon film is formed on the sliding surface of the outer clutch plate. Fine grooves are formed in the sliding surface of the inner clutch plate. The proportion of the sliding area to the sliding surface of the inner clutch plate at the initial stage of use is 55 to 90%.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2005-248894, filed on Aug. 30, 2005, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a drive force transmission device that transmits drive force through frictional engagement between drive force transmitting members that are coaxially arranged in a manner rotatable relative to each other.[0003]To improve performance, a drive force transmission device may typically include a plurality of fine grooves formed in a sliding surface of a drive force transmitting member. For example, as described in Japanese Laid-Open Patent Publication No. 2005-36863, a plurality of fine grooves are formed in a sliding surface of one of a drive clutch plate and a driven clutch plate, which form a drive force transmitting member of a drive force transmission device. The g...
Claims
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IPC IPC(8): F16D27/115F16D13/62F16D69/00
CPCF16D13/64F16D13/648F16D13/74F16D27/115F16D27/004F16D2027/008F16D2065/132F16D2069/004F16D2200/0008F16D2200/0039F16D2200/0052F16D2300/10F16D13/52
Inventor ANDO, JUNJISAKAI, NAOYUKISAKAI, TOSHIFUMISAITO, TOSHIYUKIFUKAMI, HAJIMENAKANISHI, KAZUYUKIMORI, HIROYUKITACHIKAWA, HIDEO
Owner JTEKT CORP